No, I have not misunderstood. Anyone who believes in equal rights for all should also protect the civil rights of those they do not agree with. This means that free speech, gun rights, religion, etc. are to be protected.
Why don't the Trump haters ever stand up for the opposition's rights even while vehemently disagreeing...a la Voltaire ?
Nothing special about Catholicism or Biden's belief system, but they are protected just like many others.